What percent of people would you expect to complete the form in less than 4.15 hours? percent

What percent of people would you expect to complete the form in more than 4.15 hours?
percent

What percent of people would you expect to complete the form in less than 3.1 hours?
percent

What percent of people would you expect to complete the form in more than 3.1 hours?
percent

What percent of people would you expect to complete the form between 3.1 and 4.15 hours?
percent

okay, if you need all you need to do is ask, and i'll do my best to assist you.

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4